diff options
| author | Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com> | 2010-09-19 10:47:11 -0700 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2010-10-20 12:10:58 -0500 |
| commit | 0f8151cb75e09c9a7de24a37f22166e46a9eaf7b (patch) | |
| tree | feb70b137196bc20f6d07176ecf5391ba9e0cbdc /hw/virtio-9p.c | |
| parent | df0973a4650d4889463ff66cb6fbdf0ab8090c70 (diff) | |
[virtio-9p] Ignore O_DIRECT hint from client.
The O_DIRECT flag imposes alignment restrictions on the length and address
of userspace buffers and the file offset of I/Os.
While VirtFS/9P has plans to implement O_DIRECT behavior on the server,
for now we will stick to a behavior like NFS by bypassing the page cache
only on the client. Server may still cache the I/O.
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Diffstat (limited to 'hw/virtio-9p.c')
| -rw-r--r-- | hw/virtio-9p.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index 6c807953e..cb6366bcc 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -1704,6 +1704,8 @@ static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err) if (s->proto_version == V9FS_PROTO_2000L) { flags = vs->mode; flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); + /* Ignore direct disk access hint until the server supports it. */ + flags &= ~O_DIRECT; } else { flags = omode_to_uflags(vs->mode); } @@ -1826,6 +1828,9 @@ static void v9fs_lcreate(V9fsState *s, V9fsPDU *pdu) v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data, vs->name.data); + /* Ignore direct disk access hint until the server supports it. */ + flags &= ~O_DIRECT; + vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid, gid, flags, mode); v9fs_lcreate_post_do_open2(s, vs, err); |